Me (19F) and my bf (22M) have been sexually active since a year now and before everytime we did it I always gave him a blowjob. I would look for techniques and try it on him. But since the last few months, the feeling of putting his dick on my mouth kinda makes me feel disgusted and I just cant do it. He's really understanding about it and doesnt really mind it but I feel horrible for feeling this way. Like I have done it multiple times before and swallowed his cum too and I dont mind the taste, he's also really clean & hygienic so its not the problem. But everytime I feel like giving him a head I just cannot do it. What should I do?